A Catalog of GALEX Ultraviolet Emission from Asymptotic Giant Branch Stars

We have performed a comprehensive study of the UV emission detected from AGB stars by the Galaxy Evolution Explorer (GALEX). Of the 468 AGB stars in our sample, 316 were observed by GALEX. In the NUV bandpass ($\lambda_{\rm eff} \sim 2310$z A), 179 AGB stars were detected and 137 were not detected. Only 38 AGB stars were detected in the FUV bandpass ($\lambda_{\rm eff} \sim1528$ A). We find that NUV emission is correlated with optical to near infrared emission leading to higher detection fractions among the brightest, hence closest, AGB stars. Comparing the AGB time-variable visible phased light curves to corresponding GALEX NUV phased light curves we find evidence that for some AGB stars the NUV emission varies in phase with the visible light curves. We also find evidence that the NUV emission, and possibly, the FUV emission are anti-correlated with the circumstellar envelope density. These results suggest that the origin of the GALEX-detected UV emission is an inherent characteristic of the AGB stars that can most likely be traced to a combination of photospheric and chromospheric emission. In most cases, UV detections of AGB stars are not likely to be indicative of the presence of binary companions.Comment: Accepted by ApJ; go spurs go

Renormalization Group and Grand Unification with 331 Models

By making a renormalization group analysis we explore the possibility of having a 331 model as the only intermediate gauge group between the standard model and the scale of unification of the three coupling constants. We shall assume that there is no necessarily a group of grand unification at the scale of convergence of the couplings. With this scenario, different 331 models and their corresponding supersymmetric versions are considered, and we find the versions that allow the symmetry breaking described above. Besides, the allowed interval for the 331 symmetry breaking scale, and the behavior of the running coupling constants are obtained. It worths saying that some of the supersymmetric scenarios could be natural frameworks for split supersymmetry. Finally, we look for possible 331 models with a simple group at the grand unification scale, that could fit the symmetry breaking scheme described above.Comment: 18 pages. 3 figures. Some results reinterpreted, a new section and references added. Version to appear in International Journal of Modern Physics

Kontsevich-Zorich monodromy groups of translation covers of some platonic solids

We compute the Zariski closure of the Kontsevich-Zorich monodromy groups arising from certain square tiled surfaces that are geometrically motivated. Specifically we consider three surfaces that emerge as translation covers of platonic solids and quotients of infinite polyhedra, and show that the Zariski closure of the monodromy group arising from each surface is equal to a power of $\rm{SL}(2, \mathbb{R})$. We prove our results by finding generators for the monodromy groups, using a theorem of Matheus-Yoccoz-Zmiaikou that provides constraints on the Zariski closure of the groups (to obtain an "upper bound"), and analyzing the dimension of the Lie algebra of the Zariski closure of the group (to obtain a "lower bound"). Moreover, combining our analysis with the Eskin-Kontsevich-Zorich formula, we also compute the Lyapunov spectrum of the Kontsevich-Zorich cocycle for said square-tiled surfaces.Comment: 33 pages, 15 figures. v2: Computed the Lyapunov spectrum of the surfaces, expanded the introduction, and added reference

Cultivo semi-forzado de lechuga (Lactuca sativa L.) en el Alto Valle de Río Negro y Neuquén

Trabajo final para obtener el grado de Especialista en Cultivos Intensivos, de la Universidad Nacional del Litoral, en 2018En los valles de la Norpatagonia durante diferentes épocas del año, se observa que el crecimiento de los cultivos hortícolas resulta afectado por las condiciones climáticas. El desarrollo normal de las plantas puede ser perjudicado por la presencia de fuertes vientos y heladas de variada intensidad. Para que no se malogren las cosechas se pueden plantear innovaciones tecnológicas como el uso de microtúneles que favorezcan el desarrollo de los cultivos y que hasta el momento no han sido adoptadas por los productores hortícolas del Alto Valle de Río Negro y Neuquén. Por esto, el objetivo de éste trabajo final consistió en realizar un ensayo a campo, donde se evaluaron tres variedades de lechuga, cultivadas las mismas en forma semi-forzada (con apertura y cierre del polietileno) a partir de la construcción de microtúneles, efectuándose el seguimiento de su crecimiento y determinando sus rendimientos. Para el diseño de la estructura de los microtúneles se utilizaron caños de polipropileno de ¾ pulgadas en los extremos y de ½ pulgadas en la parte interna, con un largo de 1,90 m. Sobre los arcos de polipropileno se colocaron dos tipos de polietileno, uno el polietileno Cristal de 100 micrones y el otro fue el polietileno LDT (Larga Duración Térmica) de 150 micrones. En ambos casos se compararon el comportamiento de las diferentes variedades de lechuga. En aquellas parcelas donde se utilizó la cobertura con polietileno LDT fue determinante para obtener los mejores pesos promedios de las plantas de lechugas, luego se ubicaron las lechugas protegidas con polietileno Cristal. Mientras que los rendimientos más bajos correspondieron a los cultivos desarrollados en las parcelas sin cobertura. Cuando se analizó el comportamiento de las tres variedades de lechuga dentro de los microtúneles con cobertura de polietileno LDT, se observó que los mayores pesos promedios se obtuvieron en la variedad Crespa con 300 gr, luego se ubicó la Mantecosa con 200 gr y finalmente la Morada con 145 gr. El ensayo demostró que los mayores rendimientos se lograron en las parcelas cubiertas con polietileno LDT de 150 micrones. A partir de los resultados obtenidos se puede considerar que los microtúneles son innovaciones tecnológicas, que deben ser incorporadas cuando se pretende obtener hortalizas de calidad, y cuando las condiciones climáticas de los valles del norte de la Patagonia no son favorables.In the valleys of Norpatagonia during different times of the year, it is observed that the growth of horticultural crops is affected by climatic conditions. The normal development of plants can be impaired by the presence of strong winds and frosts of varied intensity. The objective of this final work was to carry out a field trial, where three varieties of lettuce were evaluated, grown semi-forced from the construction of microtunnels, monitoring their growth and determining their Yields. In those plots where the coverage with polyethylene LDT was used was decisive to obtain the best average weights of the lettuce plants, then the lettuces protected with Crystal polyethylene were located. While the lowest yields corresponded to crops developed on uncovered plots. From the results obtained can be considered that microtunnels are technological innovations, which must be incorporated when it is intended to obtain quality vegetables, and when the climatic conditions of the valleys of northern Patagonia are not favorable.EEA Alto ValleFil: Sánchez, Jorge Rodolfo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Alto Valle. Agencia de Extensión Rural Centenario; Argentin

Producción de gírgolas sobre troncos de álamo

Dentro de la cadena trófica o alimenticia, los hongos cumplen una función degradadora, descomponiendo materia orgánica de origen vegetal o animal para transformarla en sustancias inorgánicas más simples; estos elementos son utilizados para favorecer el desarrollo de las plantas.EEA Alto Valle. AER CentenarioFil: Sánchez, Jorge Rodolfo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Alto Valle. Agencia de Extensión Rural Centenario; Argentin

Stabilization of Underactuated Systems of Degree One via Neural Interconnection and Damping Assignment Passivity Based Control

In this work, we show the potential of the universal approximation property of neural networks in the design of interconnection and damping assignment passivity-based controllers (IDA-PBC) for stabilizing nonlinear underactuated mechanical systems of degree one. Towards this end, we reformulate the IDA-PBC design methodology as a neural supervised learning problem that approximates the solution of the partial differential matching equations, which fulfills the equilibrium assignment and stability conditions. The output of the neural learning process has clear physical and control-theoretic interpretations in terms of energy, passivity and Lyapunov stability. The proposed approach is numerically evaluated in two well-known underactuated systems: the inverted pendulum on a cart and inertial wheel pendulum, whose analytic IDA-PBC solutions are non-trivial to obtain

Total Energy Shaping with Neural Interconnection and Damping Assignment - Passivity Based Control

In this work we exploit the universal approximation property of Neural Networks (NNs) to design interconnection and damping assignment (IDA) passivity-based control (PBC) schemes for fully-actuated mechanical systems in the port-Hamiltonian (pH) framework. To that end, we transform the IDA-PBC method into a supervised learning problem that solves the partial differential matching equations, and fulfills equilibrium assignment and Lyapunov stability conditions. A main consequence of this, is that the output of the learning algorithm has a clear control-theoretic interpretation in terms of passivity and Lyapunov stability. The proposed control design methodology is validated for mechanical systems of one and two degrees-of-freedom via numerical simulations.Comment: Accepted in 4th Annual Learning for Dynamics and Control (L4DC) Conferenc

Informe para la sustentación de expedientes: Expediente privado Nº 01257-2012-0-0401-JR-CI-09 Expediente público Nº 1009435-2018

El expediente privado que abordaré, versa sobre el desalojo por ocupación precaria interpuesto ante el Noveno Juzgado Especializado en lo Civil de la Corte Superior de Justicia de Arequipa. La demanda es interpuesta por LUIS VALENTÍN GÓMEZ FLORES en contra de la pareja LUIS FELIPE HERRERA RAMOS y DELIA BERSABETH MESIAS DE HERRERA por el segundo piso de un inmueble ubicado en la Av. Lambramani Nº 219, Distrito de Cercado, Provincia y Departamento de Arequipa. En primera y segunda instancia tuvieron decisiones discrepantes, en ambos, la controversia consistió en valorar el título de la demandada y determinar si ostenta la posesión del inmueble conforme a derecho. Respecto a la parte demandante, se centra en determinar si el Acta de Conciliación es un medio idóneo para configurar la ocupación precaria. El expediente fue elevado a la Sala Civil Permanente de la Corte Superior de Justicia de Lima, declarando infundada la casación interpuesta por Luis Felipe Herrera Ramos, la parte demandada. Señalando que no tiene título para poseer por cuanto el Acta de Conciliación constituye medio idóneo para demostrar que el consentimiento del demandante(propietario) ha fenecido.Trabajo de suficiencia profesiona